The correct answer is: d) All of the above.
Investment in healthcare infrastructure, improving school enrollment and quality, and skill development programs are all likely to positively impact the Human Development Index (HDI) of Manipur.
The HDI is a composite statistic of life expectancy, education, and per capita income indicators, which are used to rank countries into four tiers of human development. A higher HDI indicates a better quality of life for citizens of a country.
Investment in healthcare infrastructure can improve the quality of life for citizens by providing them with access to quality healthcare services. This can lead to a decrease in mortality rates and an increase in life expectancy.
Improving school enrollment and quality can also improve the quality of life for citizens by providing them with access to quality education. This can lead to an increase in literacy rates and an increase in employment opportunities.
Skill development programs can also improve the quality of life for citizens by providing them with the skills they need to find employment and earn a living. This can lead to an increase in income levels and an improvement in living standards.
Therefore, all of the above policy interventions are likely to positively impact the HDI of Manipur.